The affinity of hemoglobin for oxygen increases with:
A) increased hydrogen ion concentration. B) increased body temperature.
C) increased BPG (2, 3-bisphosphoglycerate). D) increased partial pressure of carbon dioxide.
Answer: C
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Voluntary neural control is necessary for:
A) contraction of the internal urethral sphincter. B) relaxation of the external urethral sphincter. C) contraction of the detrusor muscle. D) relaxation of the internal urethral sphincter.
Where is the thymus located?
A) posterior mediastinum, lateral to the spinal cord B) anterior mediastinum, posterior to the sternum C) along the curving lateral border of the stomach, extending between the 9th and 11th ribs on the left side D) posterior superior wall of the nasopharynx E) inferior to the diaphragm, medial to the liver
Which of the following is most responsible for keeping the lung surface and the thoracic wall from separating?
A. the presence of surfactant B. the negative pressure in the alveolar space C. the force exerted by the external intercostal muscles D. subatmospheric intrapleural pressure E. alveolar pressure is higher than atmospheric pressure
Lymphatic capillaries are also called __________ lymphatics.
Fill in the blank(s) with the appropriate word(s).